Exercises

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Exercise 10) Where are there more local radio stations, in the FM band or in the AM one? In Spain there are more local radio stations in the FM band. In the FM band there are 837 local stations, while in the AM there are only 197.

Exercise 11) Where are there more music radio stations, in the FM band or in the AM one? Nowadays, in Spain there is more music radio stations in the FM band than in than AM one.

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Exercise 21) Complete the following tables.

Computer 1:

	Decimal number				Binary number
IP direction	192	168	1	36	11000000	10101000	00000001	000100100
Net Mask	255	255	255	0	11111111	11111111	11111111	0000000

Computer 2:

	Decimal number				Binary number
IP direction	192	168	1	33	11000000	10101000	00000001	00100001
Net Mask	255	255	255	0	11111111	11111111	11111111	00000000

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Exercise 39) which protocol is in charge of making sure that the information arrives to the right destination? The TCP/IP protocol.

Exercise 40) The Net Mask is an IP number which allows us to... ...know which part of the IP direction matches with the identification of the net and which part identifies the host.

 Exercise 42) what do we mean when we say that the access to the Internet via ADSL is an asymmetric? This means that the bandwidth devoted to the emission of data is wider than the bandwidth devoted to the sending of information.

Exercise 39) what do we use a router for? To organize the traffic of data in the different nets.

Exercise 45)

1.      

Blu-Ray: The first consumer device arrived in stores on April 10, 2003

DVD: DVD is an optical disc storage format, invented and developed by Philips, Sony, Toshiba, and Panasonic in 1995

2.      Sony ps3 and other special players are able to read

Blu-ray discs

3.   High-definition optical disc formats: Blu-ray Disc versus HD DVD. Several disc formats that were intended to improve on the performance of the DVD were developed, including Sony's Blu-ray and Toshiba's HD-DVD, as well as HVD, FVD and VMD. The first HD-DVD player was released in March 2006, followed quickly by a Blu-ray player in June 2006. In addition to the home video standalone players for each format, Sony's PlayStation 3 video game console offers a Blu-ray Disc player and its games use that format as well.[5] The format war went largely in Blu-ray's favour after the largest movie studio supporting HD DVD, Warner Brothers, decided to abandon releasing films on HD-DVD in January 2008.[6] Shortly thereafter, several major North American rental services and retailers such as Netflix, Best Buy, Wal-Mart, etc. and disc manufacturers such as CMC Magnetics, Ritek, Anwell, and others, announced the exclusive support for Blu-ray products, ending the format war.

4.      If the two formats have compete in the same market  we would have suffered the problems of the  incompatible formats and the need to purchase specific readers for each format.